EM Waves
- Created by: alexda
- Created on: 17-05-14 18:13
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- Electromagnetic Waves
- All electromagnetic waves are transverse.
- The electromagnetic waves travel at the speed of light in a vacuum.
- Electromagnetic waves with longer wavelengths and lower frequencies have a low energy so they are the least dangerous e.g. radiowaves.
- Waves with a shorter wavelength and a higher frequency are the most dangerous because they have a high energy.
- 1. Radio waves
- Radio waves are used to broadcast TV and radio signals and to transmit satellite signals.
- 2. Microwaves
- Microwaves are used for satellite communication and transmitting signals from mobile phones.
- Microwave ovens use microwaves to heat up food.
- Microwaves can cause internal heating of body tissues.
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